code.delx.au - pulseaudio/blob - polyp/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <signal.h>
  32 #include <stddef.h>
  33 #include <assert.h>
  34 #include <ltdl.h>
  35 #include <memblock.h>
  36 #include <limits.h>
  37 #include <fcntl.h>
  38
  39 #ifdef HAVE_LIBWRAP
  40 #include <syslog.h>
  41 #include <tcpd.h>
  42 #endif
  43
  44 #include "core.h"
  45 #include "mainloop.h"
  46 #include "module.h"
  47 #include "mainloop-signal.h"
  48 #include "cmdline.h"
  49 #include "cli-command.h"
  50 #include "util.h"
  51 #include "sioman.h"
  52 #include "xmalloc.h"
  53 #include "cpulimit.h"
  54 #include "log.h"
  55 #include "daemon-conf.h"
  56 #include "dumpmodules.h"
  57 #include "caps.h"
  58 #include "cli-text.h"
  59 #include "pid.h"
  60
  61 #ifdef HAVE_LIBWRAP
  62 /* Only one instance of these variables */
  63 int allow_severity = LOG_INFO;
  64 int deny_severity = LOG_WARNING;
  65 #endif
  66
  67 static void signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  68     pa_log_info(__FILE__": Got signal %s.\n", pa_strsignal(sig));
  69
  70     switch (sig) {
  71         case SIGUSR1:
  72             pa_module_load(userdata, "module-cli", NULL);
  73             return;
  74
  75         case SIGUSR2:
  76             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
  77             return;
  78
  79         case SIGHUP: {
  80             int i;
  81
  82             for (i = 0;; i++) {
  83                 char *c;
  84                 switch (i) {
  85                     case 0:
  86                         c = pa_sink_list_to_string(userdata);
  87                         break;
  88                     case 1:
  89                         c = pa_source_list_to_string(userdata);
  90                         break;
  91                     case 2:
  92                         c = pa_sink_input_list_to_string(userdata);
  93                         break;
  94                     case 3:
  95                         c = pa_source_output_list_to_string(userdata);
  96                         break;
  97                     case 4:
  98                         c = pa_client_list_to_string(userdata);
  99                         break;
 100                     case 5:
 101                         c = pa_module_list_to_string(userdata);
 102                         break;
 103                     case 6:
 104                         c = pa_scache_list_to_string(userdata);
 105                         break;
 106                     case 7:
 107                         c = pa_autoload_list_to_string(userdata);
 108                         break;
 109                     default:
 110                         return;
 111                 }
 112                 pa_log_notice(c);
 113                 pa_xfree(c);
 114             }
 115
 116             return;
 117         }
 118
 119         case SIGINT:
 120         case SIGTERM:
 121         default:
 122             pa_log_info(__FILE__": Exiting.\n");
 123             m->quit(m, 1);
 124             return;
 125     }
 126 }
 127
 128 static void close_pipe(int p[2]) {
 129     if (p[0] != -1)
 130         close(p[0]);
 131     if (p[1] != -1)
 132         close(p[1]);
 133     p[0] = p[1] = -1;
 134 }
 135
 136 int main(int argc, char *argv[]) {
 137     struct pa_core *c;
 138     struct pa_strbuf *buf = NULL;
 139     struct pa_daemon_conf *conf;
 140     struct pa_mainloop *mainloop;
 141
 142     char *s;
 143     int r, retval = 1, d = 0;
 144     int daemon_pipe[2] = { -1, -1 };
 145     gid_t gid = (gid_t) -1;
 146     int suid_root;
 147     int valid_pid_file = 0;
 148
 149     pa_limit_caps();
 150
 151     suid_root = getuid() != 0 && geteuid() == 0;
 152
 153     if (suid_root && (pa_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
 154         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.\n");
 155         pa_drop_root();
 156     }
 157
 158     LTDL_SET_PRELOADED_SYMBOLS();
 159
 160     r = lt_dlinit();
 161     assert(r == 0);
 162
 163     pa_log_set_ident("polypaudio");
 164
 165     conf = pa_daemon_conf_new();
 166
 167     if (pa_daemon_conf_load(conf, NULL) < 0)
 168         goto finish;
 169
 170     if (pa_daemon_conf_env(conf) < 0)
 171         goto finish;
 172
 173     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 174         pa_log(__FILE__": failed to parse command line.\n");
 175         goto finish;
 176     }
 177
 178     pa_log_set_maximal_level(conf->log_level);
 179     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 180
 181     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 182         pa_raise_priority();
 183
 184     pa_drop_caps();
 185
 186     if (suid_root)
 187         pa_drop_root();
 188
 189     if (conf->dl_search_path)
 190         lt_dlsetsearchpath(conf->dl_search_path);
 191
 192     switch (conf->cmd) {
 193         case PA_CMD_DUMP_MODULES:
 194             pa_dump_modules(conf, argc-d, argv+d);
 195             retval = 0;
 196             goto finish;
 197
 198         case PA_CMD_DUMP_CONF: {
 199             char *s = pa_daemon_conf_dump(conf);
 200             fputs(s, stdout);
 201             pa_xfree(s);
 202             retval = 0;
 203             goto finish;
 204         }
 205
 206         case PA_CMD_HELP :
 207             pa_cmdline_help(argv[0]);
 208             retval = 0;
 209             goto finish;
 210
 211         case PA_CMD_VERSION :
 212             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 213             retval = 0;
 214             goto finish;
 215
 216         case PA_CMD_CHECK: {
 217             pid_t pid;
 218
 219             if (pa_pid_file_check_running(&pid) < 0) {
 220                 pa_log_info(__FILE__": daemon not running\n");
 221             } else {
 222                 pa_log_info(__FILE__": daemon running as PID %u\n", pid);
 223                 retval = 0;
 224             }
 225
 226             goto finish;
 227
 228         }
 229         case PA_CMD_KILL:
 230
 231             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 232                 pa_log(__FILE__": failed to kill daemon.\n");
 233             else
 234                 retval = 0;
 235
 236             goto finish;
 237
 238         default:
 239             assert(conf->cmd == PA_CMD_DAEMON);
 240     }
 241
 242     if (conf->daemonize) {
 243         pid_t child;
 244
 245         if (pa_stdio_acquire() < 0) {
 246             pa_log(__FILE__": failed to acquire stdio.\n");
 247             goto finish;
 248         }
 249
 250         if (pipe(daemon_pipe) < 0) {
 251             pa_log(__FILE__": failed to create pipe.\n");
 252             goto finish;
 253         }
 254
 255         if ((child = fork()) < 0) {
 256             pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 257             goto finish;
 258         }
 259
 260         if (child != 0) {
 261             /* Father */
 262
 263             close(daemon_pipe[1]);
 264             daemon_pipe[1] = -1;
 265
 266             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 267                 pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 268                 retval = 1;
 269             }
 270
 271             if (retval)
 272                 pa_log(__FILE__": daemon startup failed .\n");
 273             else
 274                 pa_log_info(__FILE__": daemon startup successful.\n");
 275
 276             goto finish;
 277         }
 278
 279         close(daemon_pipe[0]);
 280         daemon_pipe[0] = -1;
 281
 282         if (conf->auto_log_target)
 283             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 284
 285         setsid();
 286         setpgid(0,0);
 287
 288         close(0);
 289         close(1);
 290         close(2);
 291
 292         open("/dev/null", O_RDONLY);
 293         open("/dev/null", O_WRONLY);
 294         open("/dev/null", O_WRONLY);
 295     }
 296
 297     chdir("/");
 298
 299     if (conf->use_pid_file) {
 300         if (pa_pid_file_create() < 0)
 301             goto finish;
 302
 303         valid_pid_file = 1;
 304     }
 305
 306     mainloop = pa_mainloop_new();
 307     assert(mainloop);
 308
 309     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 310     assert(r == 0);
 311     pa_signal_new(SIGINT, signal_callback, c);
 312     pa_signal_new(SIGTERM, signal_callback, c);
 313     signal(SIGPIPE, SIG_IGN);
 314
 315     c = pa_core_new(pa_mainloop_get_api(mainloop));
 316     assert(c);
 317
 318     pa_signal_new(SIGUSR1, signal_callback, c);
 319     pa_signal_new(SIGUSR2, signal_callback, c);
 320     pa_signal_new(SIGHUP, signal_callback, c);
 321
 322     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 323     assert(r == 0);
 324
 325     buf = pa_strbuf_new();
 326     assert(buf);
 327     if (conf->default_script_file)
 328         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 329
 330     if (r >= 0)
 331         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 332     pa_log(s = pa_strbuf_tostring_free(buf));
 333     pa_xfree(s);
 334
 335     if (r < 0 && conf->fail) {
 336         pa_log(__FILE__": failed to initialize daemon.\n");
 337         if (conf->daemonize)
 338             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 339     } else if (!c->modules || pa_idxset_ncontents(c->modules) == 0) {
 340         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.\n");
 341         if (conf->daemonize)
 342             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 343     } else {
 344
 345         retval = 0;
 346         if (conf->daemonize)
 347             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 348
 349         c->disallow_module_loading = conf->disallow_module_loading;
 350         c->exit_idle_time = conf->exit_idle_time;
 351         c->module_idle_time = conf->module_idle_time;
 352         c->scache_idle_time = conf->scache_idle_time;
 353         c->resample_method = conf->resample_method;
 354
 355         pa_log_info(__FILE__": Daemon startup complete.\n");
 356         if (pa_mainloop_run(mainloop, &retval) < 0)
 357             retval = 1;
 358         pa_log_info(__FILE__": Daemon shutdown initiated.\n");
 359     }
 360
 361     pa_core_free(c);
 362
 363     pa_cpu_limit_done();
 364     pa_signal_done();
 365     pa_mainloop_free(mainloop);
 366
 367     pa_log_info(__FILE__": Daemon terminated.\n");
 368
 369 finish:
 370
 371     if (conf)
 372         pa_daemon_conf_free(conf);
 373
 374     if (valid_pid_file)
 375         pa_pid_file_remove();
 376
 377     close_pipe(daemon_pipe);
 378
 379     lt_dlexit();
 380
 381     return retval;
 382 }